.ascx files are user controls when used, ascx.
vb files are the code behind file for a given user control.
.
vb files are just class files and can be used as needed. (I use classes for writing helper functions and such)
.aspx.
vb files are the code behind files for an aspx page.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
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Technical Editor for:
Professional Search Engine Optimization with ASP.NET
http://www.wiley.com/WileyCDA/WileyT...470131470.html
Discussion:
http://p2p.wrox.com/topic.asp?TOPIC_ID=56429